How to progress anticorrosion of aluminium alloy data quality

Between the first phase that 1. positive pole oxidizes
Of the layer that do not have aperture during forming, ab paragraph, electrify is germinant stop hour (a few seconds arrive a few seconds) inside voltage leap, arrive at critical voltage, (the maximum of voltage) indicate at this moment zincous appearance formed layer of film of successional, imperforate. Resistance of the layer that do not have aperture is greater, obstruct velar abidance is added thick, the ply of the layer that do not have aperture and form voltage to become direct ratio, oxidation film is deliquescent in electrolyte speed becomes inverse ratio. Ply makes an appointment with 0.01 ～ 0.1 micron.
2. positive pole oxidizes the 2nd during
During poriferous layer is formed, bc paragraph, in film the thinnest place will be first be come to by deliquescent clean acupuncture point, electrolyte can arrive at aluminous new appearance through these cavity, electrochemistry echo is able to undertake continuously, resistor is reduced, voltage is reduced subsequently (reduce rise and fall the 10 ～ that are highest value 15% ) , poriferous layer appears on film.
3. positive pole oxidizes the 3rd during
Poriferous layer is added thick, cd paragraph, at this moment voltage is smooth and slow rise, be dissolved ceaselessly without aperture layer at this moment poriferous layer, friend of new the layer that do not have aperture is in grow, aperture layer is in so much to be added ceaselessly thick, when generating speed and deliquescent speed to reach dynamic equilibrium, velar ply is added no longer, at this moment resonant should break down.

The commonly used technology that 1. positive pole oxidizes
The commonly used technology that aluminium alloy positive pole oxidizes has: Technology of technology of technology of vitriolic and zincous combustion, chromic acerbity zincous combustion, combustion of oxalic acid positive pole and technology of combustion of phosphoric acid positive pole. The most commonly used is vitriolic and zincous oxidation.
2. vitriolic positive pole oxidizes
The zincous combustion technology that uses extensively domestic and internationally now is vitriolic and zincous oxidation namely, compare him to have very large dominant position on characteristic of film of manufacturing cost, oxidation and function with other method, its cost the brightly lit sex of low, film is good, anti-corrosive be able to bear or endure attrition sex good, chromatically is brief wait for good qualities. It is with rare vitriolic make electrolyte, undertake zincous oxidation to commodity, velar ply can amount to 5um, 20um, adsorptive sex of film is good, colorless brightly lit, the technology is brief, the operation is convenience.
3. chromium acerbity positive pole oxidizes
The film that chromic acerbity zincous oxidation gets is thinner, as long as 2 - 5um, can hold to the precision with original work and outside surface roughness; Hole leads low difficult coloring, do not do sealing of hole to also can be applied; Velar layer is soft, wearability is poorer but flexibility is good; Anti-corrosive force is more powerful, chromium is small to aluminous solubility, make fluid of the remain inside pinhole and aperture right of the component corrode lesser, comfortable wait for structural member at cast, this technology is used morer on the military affairs. Can undertake examining to component quality together, in crackle place Brown electrolyte can be poured out of, apparent.
Positive pole of 4. oxalic acid oxidizes
Oxalic acid is small to aluminous oxidation film dissolvability, rate of oxidation film small opening is so low, velar layer wearability and insulating property are better than vitriolic film; But cost of oxalic acid oxidation is high it is vitriolic 3~5 times; An oxalic acid is met in cathode and positive pole by echo, cause electrolyte stability to differ; The colour and lustre of film of oxalic acid oxidation follows technical condition change easily, cause commodity happening chromatism, so this technology is applied suffer sure limitation. But oxalic acid can do vitriolic oxidation additive to apply more see.
Positive pole of 5. phosphoric acid oxidizes
Oxidation film is deliquescent in phosphoric acid electrolyte than vitriolic big, because this oxidation film is thin (want 3um only) , an aperture is big. Because phosphoric acid film has stronger water proofing property, but obstruct glue sticky agent it is good that because of hydration ageing makes the adhesion of adhesive bonding agent is compared, so principal the pretreatment of the outside processing that is used at printing plate and aluminous workpiece adhesive bonding.

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